Biography
Aleksandra Glowka has completed her MSc from Adam Mickiewicz University in Poznan and started PhD studies at the same University. She works as a researcher in the Laboratory of Applied Chemistry. She has published 3 papers in post-conference materials.
Abstract
Oral bioavailability is important parameter during develop the new drugs. About 40% of new drug compounds exhibit low solubility in water, which means low oral bioavailability, associated with Biopharmaceutical Classification System class II (BCS) drugs. In recent years, much attention has been focused on emulsion forming drug delivery systems such as: self-emulsifying (SEEDS), self-microemulsifying (SMEDDS) and self-nanoemulsifying drug delivery system (SNEDDS) to improve these inconveniences. Discussed systems are isotropic mixtures consist of oils, surfactants and co-surfactants/co-solvents, which emulsify under conditions of gentle agitation, when come in contact with gastro-intestinal fluid. SEDDS form surfactants of HLB<12 and SMEDDS, SNEDDS are using surfactants of HLB>12. SEDDS has droplet size in the ranges from 200 nm to 5 µm, SMEDDS – less than 200 nm and SNEDDS in the ranges from less than 100 nm. They are thermodynamically stable systems. Hydrolyzed vegetable oils are widely used as oil components. Sorbitan monooleate (Span 80) is often used as a surfactant. Co-surfactants are preferably short and medium-chain alcohols such as octanol, which are known to formulate the spontaneous self-emulsifying formulation. Glycols are used a co-solvents, e.g. propylene glycol. These systems can be dispensed in a soft or hard gelatin, capsule, tablets and pellets. All descripted drug delivery systems can be characterized by ternary/pseudo ternary phase diagram, droplet size or zeta potential. Emulsion forming drug delivery systems are promising approach to be used as effective drug delivery vehicles for wide range of drugs. They improve oral bioavailability, are easy to prepare and reduce the drug dose.
Biography
Tripti Mishra has completed her MSc from Lucknow University and is pursuing PhD from Kumaun University, Nainital Uttarakhand India. She is the Research Scholar at Phytochemistry Division of CSIR-National Botanical Research Institute, Lucknow India. She has published three papers in reputed journals along with two book chapters and five popular articles.
Abstract
Betula utilis (Betulaceae family) is a moderate-sized tree occurs at high altitudes of Himalayas and well known for having its anticancer activity. The present research work deals with the cytotoxic activity of isolated triterpenes along with primary screening of six solvent extracts of Betula utilis bark. Moreover compound mediated massive ROS generation and mitochondrial membrane potential disruption tumor cell migration study also has been done. Bark of Betula utilis were extracted in six different solvents. All the six extracts have been evaluated for in vitro anticancer activity. The most potent fractions in terms of cytotoxic activity against various cancer cell lines were subjected to column chromatography for isolation of pure compounds. Six triterpenes such as betulin, betulinic acid, lupeol, ursolic acid, oleanolic acid and β-amyrin have been isolated from Betula utilis bark. The structures of these compounds have been established by spectroscopic methods. All the isolated triterpenes have been tested for in vitro cytotoxic activity. Ursolic acid has been identified as the most robust tumor cell selective cytotoxic activity against breast cancer. Ursolic acid mediated massive ROS generation and mitochondrial membrane potential disruption are the major factors for contributing anticancer potential of the particular fraction. Ursolic acid also significantly inhibited the tumor cell migration. Betula utilis is novel source of ursolic acid having potent tumor cell selective anticancer properties.